Re: [R] D-optimum design - optimization model in R

Dear Bert Gunter, Thank you for your advice. I will take care in the next post. Best regards, Nhat Tran. Vào Th 3, 4 thg 12, 2018 vào lúc 23:16 Bert Gunter đã viết: > Please do not re-post. To increase your chance of getting a useful answer, > read and follow the posting guide below, which

Re: [R] Random projection

Your multiplication description sounds more like matrix multiplication than scalar multiplication. R supports matrix multiplication with the %*% operator. I didn't follow the rest of your description... are you doing a homework assignment? There is a no homework policy on this list... On Decemb

[R] Random projection

Hello I was wondering if anyone could help. I am using R to perform random projection on Gaussians. I need to take k Gaussian random vectors U1,...,Uk in R(reals) Then for any vector v in d dimensions, perform the random projection: f(v) = v.U1, v.U2, ..., v.Uk which reduces v from d dimensions

[R] Select behavior dependant with other factors and its formalization

Hi, I'm studying occurence of Behavior11, Behavior12,Behavior2,Behavior3 according three variables : Times : task time Time_interval :task time in interval Frequency:Frequency of the task For this purpose, I use GLM attach(datas) an11=anova(glm(Behavior11 ~ Times + Frequency, family=bino

Re: [R] D-optimum design - optimization model in R

Please do not re-post. To increase your chance of getting a useful answer, read and follow the posting guide below, which you have not yet done. For example, what is "F.cube", what packages are you using? Also, this list is about R programming, not statistics, which is more what your query seems to

Re: [R] POSIXct format

Hi, It is because the print method for POSIXct likely tries to simplify. To see it in the format you desire, you need to be explicit when calling it. x = as.POSIXct('2018-11-2700:00:00', format = "%Y-%m-%d%H:%M:%S", tz = 'UTC') format(x, "%Y-%m-%d %H:%M:%S %Z") [1] "2018-11-27 00:00:00 UTC" Ch

[R] POSIXct format

Hi, I am trying to format my Character strings to POSIXct as below : > as.POSIXct('2018-11-2700:00:00', format = "%Y-%m-%d%H:%M:%S", tz = 'UTC') [1] "2018-11-27 UTC" > as.POSIXct('2018-11-2701:00:00', format = "%Y-%m-%d%H:%M:%S", tz = 'UTC') [1] "2018-11-27 01:00:00 UTC" For the first case, I wa

[R] D-optimum design - optimization model in R

Dear all, I'm trying to use the D-optimum design. In my data, the response is KIC, and 4 factors are AC, AV, T, and Temp. A typical second-degree response modeling is as follows: > data<-read.csv("2.csv", header =T) > mod <- lm(KIC~AC+I(AC^2)+AV+I(AV^2)+T+I(T^2)+Temp+I(Temp^2)+AC:AV+AC:T+AC:

[R] Weighting Document for Text Clouds

Hello All, The link below shows the 5 steps required to build a text cloud from a text file of documents (e.g., posts, tweets, etc.). http://www.sthda.com/english/wiki/text-mining-and-word-cloud-fundamentals-in-r-5-simple-steps-you-should-know The R script in the link loads the text into a char

[R] survival::survfit.coxph confidence vs prediction intervals r-help x

Dear list, I'm trying to understand what kind of uncertainty intervals are plotted for survival::survfit.coxph when 'conf.int=TRUE' is called, e.g.: f <- coxph(Surv(futime, fustat) ~ age, data = ovarian) s <- survfit(f, newdata=data.frame(age=c(30, 60))) plot(s, conf.int=TRUE) Are these bands th